First things first: Nobody makes it into the pros by being a bad athlete. Well, David Wells made it into the pros, and so did Bartolo Colon, but baseball is a different planet as far as athleticism is concerned.
The guys we're talking about here aren't bad athletes, at least in the traditional sense. They're doubtlessly a zillion times more athletic than any of us laypeople. But you can't tell me that when the San Francisco Giants agreed to pay Barry Zito $126 million over seven years, he'd be...what he is.
Or that when Derek Anderson essentially robbed both the Cleveland Browns and the Arizona Cardinals on two separate occasions, he would end up being one of football's biggest punchlines.
Could these guys—every single one of them—dominate any of us in any test of physical exertion? Absolutely.
But that doesn't mean they're worth millions of dollars.